Ok so first off I am trying to make Pinkie Pies Gala Dress, I can't draw very well so this artist's design is the closest to what I'm trying to create:

I want to make my dress so that its open in the front but long on the sides and back, like this (forgive the crappy paint drawing):

I have this pattern for the top of the dress and inner skirt:

I'm using the alice dress.

My question is how do I do the longer skirt? Like what pattern would be a good pattern to use for it? Is this even possible? If its not please suggestions on what to do. And how would I make it so the outer skirt would poof out, will I need a petticoat? Do they sell a petticoat that will work for this type dress or will I need to make one?

Any help would be great please!

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For the long skirt, unless I'm terribly mistaken and someone can correct me, it looks like a partial circle skirt. You may be able to use newspaper to draft the pattern using the tutorials available online, and tape the pieces together. Have someone help hold the pattern around your low waist to make sure it fits correctly. Wear the proper shoes, too, to check the length. Hopefully this is correct...
Otherwise you could add a slit to a full length a-line skirt, and add a zipper along the side or back seam. Good luck!

Ok so do you think using this pattern could work for the longer skirt if I just leave out the middle section of it? -

I ask because I already own this pattern as I made my daughter of evil rin dress with it. Or do you think it will look not right and I should try drafting something instead? Also do you know if they sell a petticoat that is shorter in the front or do you think I will have to buy a full one and cut it?

__________________Ichiru-chan

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(+'.'+) This is Bunny. Copy and paste bunny into your
(")_(") signature to help him gain world domination(I did)